Step stool



FIG. 1 is a perspective view of a step stool in accordance with our newdesign;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left-side elevational view thereof, the left and right sidesof the step stool of FIG. 1 being symmetrical to one another; and,

FIG. 5 is a bottom plan view thereof, with portions of the step stoolbeing shown in broken lines, which broken lines are for illustrativepurposes only and form no part of the claimed design.

The ornamental design for a step stool, as shown and described.